base32::core(3tcl)						  Base32 encoding						base32::core(3tcl)

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NAME

       base32::core - Expanding basic base32 maps

SYNOPSIS

       package require Tcl  8.4

       package require base32::core  ?0.1?

       ::base32::core::define map forwvar backwvar ivar

       ::base32::core::valid string pattern mvar

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DESCRIPTION

       This package provides generic commands for the construction of full base32 mappings from a basic mapping listing just the codes and associ-
       ated characters. The full mappings, regular and inverse, created here map to and from bit sequences, and also handle the  partial  mappings
       at the end of a string.

       This  is  in essence an internal package to be used by implementors of a base32 en- and decoder. A regular user has no need of this package
       at all.

API

       ::base32::core::define map forwvar backwvar ivar
	      This command computes full forward and backward (inverse) mappings from the basic map and stores them in the variables named by for-
	      wvar  and  backwvar  resp.  It also constructs a regexp pattern for the detection of invalid characters in supposedly base32 encoded
	      input and stores it in the variable named by ivar.

       ::base32::core::valid string pattern mvar
	      This command checks if the input string is a valid base32 encoded string, based on the pattern of invalid characters as generated by
	      ::base32::core::define, and some other general rules.

	      The  result of the command is a boolean flag. Its value is True for a valid string, and False otherwise. In the latter case an error
	      message describing the problem with the input is stored into the variable named by mvar. The variable is not touched  if	the  input
	      was found to be valid.

	      The rules checked by the command, beyond rejection of bad characters, are:

	      [1]    The length of the input is not a multiple of eight,

	      [2]    The padding appears not at the end of input, but in the middle,

	      [3]    The padding has not of length six, four, three, or one characters,

BUGS, IDEAS, FEEDBACK
       This  document,	and the package it describes, will undoubtedly contain bugs and other problems.  Please report such in the category base32
       of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you may have for
       either package and/or documentation.

KEYWORDS

       base32

CATEGORY

       Text processing

COPYRIGHT

       Copyright (c) Public domain

base32									0.1							base32::core(3tcl)